3Install Open the file and place the application where you want. On first launch Java may install itself automatically. This will last only a few minutes.

4Authorize On the recent OSX Versions,
you need to authorize the application: on the first start,
use right-click or option-click + Open to bring a dialog that will let you open the application.
Do not take Apple's fearmongering message into account, as it is mostly meant to secure a tax on developments made for its platform.

Unix/Linux :

1Check you have Java 1.4 or higher (6 recommended). go to java.com/download if you're unsure.